Another marvelous subtle move. Maybe it's not the best according to computer science, but it's a very good choice for human play.
32... h7e4  33. b8a7  33... e4d5  34. a2a4 White is a pawn up with good winning chances. Maybe it's still a draw with perfect play, but this a thankless task against Carlsen. 34... f6f5 Trying to create active play in the kingside.